JoinedData

Join a table of data to the features of a source with feature state. Put this component inside a source component, such as VectorTileSource or GeoJSON.

For each row in data, the component finds the feature whose ID is the value of the idCol column, and sets the values of the row as the feature state of that feature. Use sourceLayer with vector tile sources. You can then use feature-state expressions in layer paint properties to style the features.

When a row is removed from data, the component removes the feature state keys for that feature. It does not change other state on the feature, such as hover state. This component does not render anything.